I'm a bullitbiter so to speak...For one I do not own a microracer I'm orientating over here for my lowrider modelcars scalling from 1/64 to 1/10 all hooked up with motors to do all the hop and move stuff.
http://www.e-zone.nl/jevries
I fried 5 circuitboards ranging from 3V to 6V RC cars...
The 3V ones couldn't handle the 9V battery...well mabye for 20 sec than smoke came out of the car....not the motor but the circuitboard was fried.
The 6V RC handle the 9V battery well...but a 9,6 accupack fried the board because of the high amps.
I would love to believe these small and tiny circuit boards could handle a 9V battery...leading to a relay instead of a small motor but as stated before...where's the proof.
let me see someone pick a 9V battery hook it up to the connectors, taping it and letting the car run and steer..you would make my day since it opens lot's of doors for me.